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<!DOCTYPE html> <html> <body> <h2>JavaScript 数组</h2> <p>如果在访问数组时使用命名索引，JavaScript 会将数组重新定义为标准对象，一些数组方法和属性会产生未定义或不正确的结果。</p> <p id="demo"></p> <script> var person = []; person["firstName"] = "John"; person["lastName"] = "Doe"; person["age"] = 46; document.getElementById("demo").innerHTML = person[0] + " " + person.length; </script> </body> </html>